PLC (Programmable Logic Controller)
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This document is a supplement to the “Lab 1.doc” lab exercise that introduces one to the basics of ladder logic programming. The following equipment is assumed: A-B 1756-A10 10-slot chassis A-B 1756-P___ power supply A-B 1756-L61 (Rev 18) processor in slot 0 A-B 1756-IB32 (Rev A) discrete input module in slot 1 A-B 1756-OB16I (Rev A) discrete output module in slot 2 This document is primarily for Rev 18 of th e RSLogix5000 software. A serial cable connection from the PC to the processor is also assumed.
In order to become familiar with ba sic ladder logic programming and addressing techniques on the ControlLogix pr ocessors, the steps to accomplish the first part of the first lab exercise are outlined in sections A and B. Th e remainder of the sections outline the steps to document your ladder, to print the ladder logic program, and to save your ladder logic diagram. In an industrial setting, the initial PLC programming is done offline and then later downloaded to the PLC when ready for the final test and debug. In a ddition, there is usually only one project (program) for each PLC on th e network. For these labs, the ladder programming will be done online so that changes can be immediately tested. Rockwell Software RSLogix5000 is used to program the Allen-Bradley ControlLogix. An icon for this program should already be on the desktop. The PLC and the PC used to program it are connected directly through a serial RS-232 link. For the casual user, the RSLogix software is best operated using the point-and-click approach. Towards the top of the screen, buttons for frequently-used commands are displayed in toolbars. One may click on the button, or acce ss the function by selecting commands from the menu at the top of the screen. The various func tions of the software may also be accessed by typing various letter mnemonic commands, but unless you use the software extensively, the learning curve is too st eep for this laboratory.
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